import java.sql.*;

public class Hello {
    public static void main(String[] args) {
        Connection connection =null;
        PreparedStatement preparedStatement =null;
        ResultSet resultSet =null;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            String url="jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            connection = DriverManager.getConnection(url, "root", "coup");
//            if (connection!=null){
//                System.out.println("连接成功");
//            }
            String sql = "SELECT*FROM user3;";
            preparedStatement = connection.prepareStatement(sql);
            resultSet = preparedStatement.executeQuery();
            while (resultSet.next()){
                int id = resultSet.getInt(1);
                String name = resultSet.getString(2);
                String pass = resultSet.getString(3);
                System.out.println(id+"----"+name+"----"+pass);

            }


        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            try {
                if (resultSet!=null){
                    resultSet.close();
                }
                if (resultSet!=null){
                    preparedStatement.close();
                }
                if (resultSet!=null){
                    connection.close();
                }

            } catch (SQLException e) {
                throw new RuntimeException(e);
            }

        }
    }
}
